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This sections documents various protocols and transports that are
available in the distribution.
+
+(((protocol)))
+Protocols represent "`patterns`" of communication, such as
+request/reply, publish/subscribe, and so forth.
+A given <<nng_socket.5#,socket>> is created with exactly one protocol, and that
+protocol defines the key behavior of the socket.
+
+(((transport)))
+Conversely, transports are the underlying mechansims by which messages
+are moved between participants, such as TCP/IP or UNIX domain IPC.
+A given <<nng_socket.5#,socket>> may be using several transports at the same
+time.